清除浮动

方法1:在浮动元素后面增加空白元素用上clear:both

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>清除浮动</title>
    <style>
        .box {
            background-color: #2AB561;
            border: 1px solid red;
        }

        .one {
            width: 100px;
            height: 50px;
            background-color: #0DA5D6;
            float: left;
        }

        .two {
            float: left;
            width: 100px;
            height: 50px;
            background-color: #1b6d85;
        }

        .three {
            width: 200px;
            height: 100px;
            background-color: #0f0f0f;
        }
        .four{
            clear: both;
        }

    </style>
</head>
<body>
<div class="box">
    <div class="one"></div>
    <div class="two"></div>
    <div class="four"></div>
</div>
<div class="three"></div>
</body>
</html>

方法2:父级添加overflow：hidden

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>清除浮动</title>
    <style>
        .box {
            background-color: #2AB561;
            border: 1px solid red;
            /*overflow触发BFC，BFC可以清除浮动*/
            overflow: hidden; 
        }

        .one {
            width: 100px;
            height: 50px;
            background-color: #0DA5D6;
            float: left;
        }

        .two {
            float: left;
            width: 100px;
            height: 50px;
            background-color: #1b6d85;
        }

        .three {
            width: 200px;
            height: 100px;
            background-color: #0f0f0f;
        }


    </style>
</head>
<body>
<div class="box">
    <div class="one"></div>
    <div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>

方法3:添加伪元素

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>清除浮动</title>
    <style>
        .box {
            background-color: #2AB561;
            border: 1px solid red;
        }

        .one {
            width: 100px;
            height: 50px;
            background-color: #0DA5D6;
            float: left;
        }

        .two {
            float: left;
            width: 100px;
            height: 50px;
            background-color: #1b6d85;
        }

        .three {
            width: 200px;
            height: 100px;
            background-color: #0f0f0f;
        }

        .clearFloat:after {
            /*避免有空隙*/
            content: '.';
            /*变成块级元素*/
            display: block;
            /*隐藏content*/
            visibility: hidden;
            clear: both;
            /*清除盒子高度*/
            height: 0;

        }

        .clearFloat {
            /*兼容IE6，7*/
            *zoom: 1;
        }


    </style>
</head>
<body>
<div class="box clearFloat">
    <div class="one"></div>
    <div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>

方法4:双伪元素清除浮动

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>清除浮动</title>
    <style>
        .box {
            background-color: #2AB561;
            border: 1px solid red;
        }

        .one {
            width: 100px;
            height: 50px;
            background-color: #0DA5D6;
            float: left;
        }

        .two {
            float: left;
            width: 100px;
            height: 50px;
            background-color: #1b6d85;
        }

        .three {
            width: 200px;
            height: 100px;
            background-color: #0f0f0f;
        }

        .clearFloat:before ,.clearFloat:after {
            /*避免有空隙*/
            content: '';
            /*变成块级元素*/
            display: table;
        }
        .clearFloat:after{
            clear: both;
        }

        .clearFloat {
            /*兼容IE6，7*/
            *zoom: 1;
        }


    </style>
</head>
<body>
<div class="box clearFloat">
    <div class="one"></div>
    <div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>

推荐阅读更多精彩内容